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Date: Sun, 26 Jan 2014 16:23:14 +0800 From: Ren Qiaowei <qiaowei.ren@...el.com> To: Ingo Molnar <mingo@...nel.org> CC: "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, x86@...nel.org, linux-kernel@...r.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [PATCH v3 3/4] x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX_RELEASE On 01/26/2014 04:22 PM, Ingo Molnar wrote: > > * Qiaowei Ren <qiaowei.ren@...el.com> wrote: > >> This patch adds the PR_MPX_INIT and PR_MPX_RELEASE prctl() >> commands on the x86 platform. These commands can be used to >> init and release MPX related resource. >> >> A MMU notifier will be registered during PR_MPX_INIT >> command execution. So the bound tables can be automatically >> deallocated when one memory area is unmapped. >> >> Signed-off-by: Qiaowei Ren <qiaowei.ren@...el.com> >> --- >> arch/x86/Kconfig | 4 ++ >> arch/x86/include/asm/mpx.h | 9 ++++ >> arch/x86/include/asm/processor.h | 16 +++++++ >> arch/x86/kernel/mpx.c | 84 ++++++++++++++++++++++++++++++++++++++ >> include/uapi/linux/prctl.h | 6 +++ >> kernel/sys.c | 12 +++++ >> 6 files changed, 131 insertions(+), 0 deletions(-) > > Hm. What is the expected typical frequency of these syscalls for a > larger application like a web browser? Only once per startup > typically, or will they be called more frequently? > It will be only once per startup. Thanks, Qiaowei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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